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$Mike70Z-28

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Discussion starter · #1 ·
im thinking of doing a cam swap i need your thoughts

355 sbc
pro filers 195cc
compression 11.1 quench .037
tko 600
373 rear
air gap 750dp
the cam i have in there now is comp cams magnum 292hyd 244@.50 501 lift
i know if i go solid i will make power. but i don't want to change spring so i want to stay hyd . this is the cam i was looking at.

http://www.lunatipower.com/Product.aspx?id=1986&gid=287
or if you guys have something in mind
 
#2 ·
I noticed that you picked the most powerful hydraulic cam ever designed! Surfing the bottom of the page in a cam catalog will get you the most radical cam. This yields a radical cam, that will not be street friendly.

The Lunati cam catalog states that they (I believe it was designed by UD Harold) was "Designed for Very Hot street/bracket race applications" This cam requires a minimum of 10.5:1 compression, 4.11 gearing and a 3,500 RPM stall converter!. Do you have a 3,500 RPM stall converter now?

Cam Specifications according to the cam card are:
Duration at 0.050" of Valve lift (Int/Exh): 241°/249°
Gross Valve Lift at the Valve with a 1.5:1 Rocker (Int/Exh): 0.525"/0.546"
LSA: 110°
ICL: 106°
RPM Range: 2500-6600

You are going in the right direction with this cam, in that it has more valve lift. You want to maximize the cam lift, and minimize the duration, and to widen the LSA for a street driven cam to obtain a good cam. If you want a race car for your trailer you want a solid roller that will spin your 355 up to a 8,600 RPM shift point, a 5,400 RPM torque converter launching off your trans brake, and 5.38 rear gears. You also need to pump up the compression. In any case your quench is on the tight side so be very, very carful of valve to piston interference at 10° before TDC.

Big Dave
 
#3 ·
I had that same magnum 292 in my 355in. chevelle, it ran pretty good, and sounded pretty damn good too.

The hyd roller cam I just got for my 421" build has just about the same specs as that lunati cam you specd.
duration @.50" 241/ 247
Lift .545/ .565
lobe 110
center line 106

That lunati should be pretty nasty in a 355.
 
#4 ·
Mike, personally I`d call Chris Straub and get this done right for `your` car

Cheers
Steve
 
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#5 ·
You've got heads to make peak power at 7200 rpm. You won't need much cam in this engine to make gobs of power. Give the engine cylinder head, you take away camshaft. If your looking to make power to around 6200-6400 then all you will need is:

150-3102K

SBC 350 to 360 CID AFR 180 to 190 Head Max Power 6000-6200 rpm Peak Torque 3800. This cam takes advantage of the AFR’s Intake to Exhaust flow ratio. This cam maximizes the power of these heads creating a forever long band of power. To extend power another 200 rpm use 1.6 ratio on both intake and exhaust. 1 5/8” headers are needed to for this application.

Lift .510/.492
Adv 280/282
.050” 221/223
Lobe Sep 108
 
#6 ·
$Mike70Z-28 said:
i know if i go solid i will make power.
Click to expand...
Not necessarily. Read up about solid vs hydraulic, you'll be surprised.

I have this hyd roller cam in my 70 Z28.

Lunati Cam 20120121
Advertised Duration (Intake/Exhaust) 278/288
•Duration @.050" (Intake/Exhaust) 232/242
•Gross Valve Lift (Intake/Exhaust) .507"/.507"
•Lobe Separation 112
•Intake Center Line 108
•RPM Range 2000-6400

Using a B28 vacuum can with a home made limiter plate.
 
#8 ·
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cstraub
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